Sometimes, symptoms of the disease appear and then disappear for a long time.

VOA: special.2009.01.06

And then sometimes we'll see you need to escape even more useful characters.

有时我们需要你,用一些有实际意义的字符与其他字符隔开。

哈佛公开课 - 计算机科学课程节选

because we'd have different sleep times and then sometimes I would sleep loud and she... you know.

因为我们睡觉的时间不一样，有时候我睡觉的声音大，她就会……你懂得。

与室友和睦相处 - SpeakingMax英语口语达人

For example,fake identity cards are sometimes used to take away subsidized food grains meant for the poor and which are then sold for profit.

VOA: standard.2009.09.24

So I would write that and then sometimes I'd have other work for those classes.

我会赶紧写作业，有时还要写其他课的作业。

耶鲁的忙碌生活 - SpeakingMax英语口语达人

"Right now we have about They get one package of food every two weeks, a total of six packages if they are really in dire circumstances then we sometimes renew their order and send them another six packages."

VOA: standard.2009.09.09

Mostly it's a lot of freshmen and then sometimes some sophomores.

大部分是大一新生，有时候有些大二的。

加入女生社团 - SpeakingMax英语口语达人

You might recall from grade school sometimes you put things in parentheses so that your addition happens first, then your multiplication, otherwise multiplication would happen by default first.

你们可能会想起小学时，将一些加法表达式,放在圆括号里，这样加法可以先计算，然后是乘法，否则，乘法默认先发生。

哈佛公开课 - 计算机科学课程节选

Sometimes you may be listening to a lecture and then half way through it there is an emergency.

有时候讲座过程中，突然有紧急情况。

哈佛公开课 - 幸福课课程节选

And sometimes it's not good to repeat it too often; then you start to become unhinged.

有时重复太多遍也不太好;,你会开始变得神经错乱。

耶鲁公开课 - 现代诗歌课程节选

Because sometimes the value of a combination is different then the value you would get by just thinking about each one of the parts in isolation and then adding them up.

因为有时一个组合的价值会不同,那么你得到的价值是只单独考虑每一部分,然后把它们相加所得。

耶鲁公开课 - 死亡课程节选

The trouble with the etymology of theory and the way in which the word has been used traditionally is that sometimes it actually means practice, and then at other historical periods it means something very different from practice, something typically from which practice is derived.

理论这个词在词源,和传统的使用方法上的复杂之处在于,它有时候指的是实践，但在特定的历史时期,它指的是和实践非常不同的东西，也就是实践产生的依据。

耶鲁公开课 - 文学理论导论课程节选

And often, if you want to make a lot of it, you have to think about the thermodynamics of the system, how fast the reactions will go and kinetics, and then whether they'll go, the thermodynamics, and sometimes then you need to adjust the reactions, maybe use a transition metal to make it go better.

这种分子就不能正常工作，而且通常来说,如果你要大量生产一个东西,你必须考虑系统的热力学，反应速率和动力学,还有反应是否会发生，热力学，而且有时候你需要调整反应的发生。

麻省理工公开课 - 化学原理课程节选

and then I had my test after that, so... That happens sometimes.

然后我就考试，所以……有时候是这样。

开放式的课程？ - SpeakingMax英语口语达人